During the first part of the 19th century, it was mainly "<span>C. the railroad and the telegraph" that</span> revolutionized transportation and communication, since these greatly increased efficiency and speed.
Answer: The Constitution has been changed by basic legislation by Congress, actions taken by the President, key decisions of the Supreme Court, the activities of political parties, and ect.
Explanation:
The purpose of the government is to "establish Justice, insure domestic Tranquility, provide for the common defence, and promote the general welfare."
So, mostly everything to do with society's welfare.
Slaves were mostly traded for "manufactured goods", since these goods came from England to Africa as part of the "Triangle Trade" that existed between Africa, the West Indies, and Europe.
